A series of bismuth-oxychloride/bismuth-oxyiodide/graphene-oxide nanocomposites: Synthesis, characterization, and photcatalytic activity and mechanism

Lee, Yu-Hsun; Dai, Yong‐Ming; Fu, Jing-Ya; Chen, Chiing‐Chang

doi:10.1016/j.mcat.2017.01.002

Cited by 109 publications

(15 citation statements)

References 62 publications

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“…As shown in Figure 2a, the SrFe 12 O 19 is a hexagonal-shape, which is consistent with the literature [26]. Figure 2b shows that the BiOBr nanosheets assembled as “petals” and formed a flower-like microstructure, which could provide more active sites for the adsorption of organic pollutants and help to enhance the photocatalytic activity for the pollutants’ decomposition [33]. As for BOB/SFO-5 (Figure 2c), SrFe 12 O 19 nanosheets were inserted into a BiOBr flower-like shape, which indicated that the irregularly flaky-shape aggregated on the surface of BiOBr.…”

Section: Resultssupporting

confidence: 86%

“…Figure 10 shows the RhB degradation rates over BOB/SFO-5 under different active radical species scavengers. It can be seen from Figure 10 that the introduction of the superoxide radical (O 2 − ) scavenger, BZQ, caused degradation rate declination, namely, the photocatalytic rate was directly proportional to the amount of O 2 − , proving the dominant role of O 2 − in the photocatalytic process, which was identified by the EPR spectra for DMPO, and O 2 − acted as the most active species [33,34]. The RhB degradation rates in the hole (h + ) scavenger, Na 2 -EDTA, were slightly larger than those in BZQ.…”

Section: Resultsmentioning

confidence: 99%

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Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets

Xie

Yang

et al. 2019

Nanomaterials

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Magnetic BiOBr/SrFe12O19 nanosheets were successfully synthesized using the hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and UV-visible diffused reflectance spectra (UV-DRS), and the magnetic properties were tested using a vibration sample magnetometer (VSM). The as-produced composite with an irregular flaky-shaped aggregate possesses a good anti-demagnetization ability (Hc = 861.04 G) and a high photocatalytic efficiency. Under visible light (λ > 420 nm) and UV light-emitting diode (LED) irradiation, the photodegradation rates of Rhodamine B (RhB) using BiOBr/SrFe12O19 (5 wt %) (BOB/SFO-5) after 30 min of reaction were 97% and 98%, respectively, which were higher than that using BiOBr (87%). The degradation rate of RhB using the recovered BiOBr/5 wt % SrFe12O19 (marked as BOB/SFO-5) was still more than 85% in the fifth cycle, indicating the high stability of the composite catalyst. Meanwhile, after five cycles, the magnetic properties were still as stable as before. The radical-capture experiments proved that superoxide radicals and holes were main active species in the photocatalytic degradation of RhB.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets

Xie

Yang

et al. 2019

Nanomaterials

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“…Bismuth oxides and their composites (e.g., bismuth oxyiodides [5], bismuth oxyiodide/graphitic carbon nitride [6], and BiO x I y /GO [7]) have been widely used for photocatalytic degradation of dyes, owing to their superior photocatalytic traits. Bismuth vanadate (BiVO 4 ) has the advantages of no toxicity, low cost, high chemical stability, photocorrosion resistance, and strong response to visible light ( E g ~ 2.40 eV) [8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Bi2S3/BiVO4 Heterojunction with a One-Step Hydrothermal Method Based on pH Control and the Evaluation of Visible-Light Photocatalytic Performance

Zhao

Wang²,

Zong

et al. 2017

Materials

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The band gaps of bismuth vanadate (BiVO4) and bismuth sulfide (Bi2S3) are about 2.40 eV and 1.30 eV, respectively. Although both BiVO4 and Bi2S3 are capable of strong visible light absorption, electron–hole recombination occurs easily. To solve this problem, we designed a one-step hydrothermal method for synthesizing a Bismuth sulfide (Bi2S3)/Bismuth vanadate (BiVO4) heterojunction using polyvinylpyrrolidone K-30 (PVP) as a structure-directing agent, and 2-Amino-3-mercaptopropanoic acid (l-cysteine) as a sulfur source. The pH of the reaction solution was regulated to yield different products: when the pH was 7.5, only monoclinic BiVO4 was produced (sample 7.5); when the pH was 8.0 or 8.5, both Bi2S3 and BiVO4 were produced (samples 8.0 and 8.5); and when the pH was 9.0, only Bi2S3 was produced (sample 9.0). In sample 8.0, Bi2S3 and BiVO4 were closely integrated with each other, with Bi2S3 particles formed on the surface of concentric BiVO4 layers, but the two compounds grew separately in a pH solution of 8.5. Visible-light photocatalytic degradation experiments demonstrated that the degradation efficiency of the Bi2S3/BiVO4 heterojunction was highest when prepared under a pH of 8.0. The initial rhodamine B in the solution (5 mg/L) was completely degraded within three hours. Recycling experiments verified the high stability of Bi2S3/BiVO4. The synthesis method proposed in this paper is expected to enable large-scale and practical use of Bi2S3/BiVO4.

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“…Acong et al [288] reported an all-solid-state Z-scheme system containing BiOI/Bi2S3/rGO composites for simultaneous removal of aqueous Cr(VI) and phenol [288]. A series of bismuth-graphene nanocomposite systems were summarized by Yu-Hsun et al [289] for adequate catalytic activity and stability, acting as visible-light-driven photocatalysts in efficient organic pollutant degradation. single oxygen under the white LED irradiation.…”

Section: Organic Degradationmentioning

confidence: 99%

Bismuth-Graphene Nanohybrids: Synthesis, Reaction Mechanisms, and Photocatalytic Applications—A Review

et al. 2021

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Photocatalysis is a classical solution to energy conversion and environmental pollution control problems. In photocatalysis, the development and exploration of new visible light catalysts and their synthesis and modification strategies are crucial. It is also essential to understand the mechanism of these reactions in the various reaction media. Recently, bismuth and graphene’s unique geometrical and electronic properties have attracted considerable attention in photocatalysis. This review summarizes bismuth-graphene nanohybrids’ synthetic processes with various design considerations, fundamental mechanisms of action, heterogeneous photocatalysis, benefits, and challenges. Some key applications in energy conversion and environmental pollution control are discussed, such as CO2 reduction, water splitting, pollutant degradation, disinfection, and organic transformations. The detailed perspective of bismuth-graphene nanohybrids’ applications in various research fields presented herein should be of equal interest to academic and industrial scientists.

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A series of bismuth-oxychloride/bismuth-oxyiodide/graphene-oxide nanocomposites: Synthesis, characterization, and photcatalytic activity and mechanism

Cited by 109 publications

References 62 publications

Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets

Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets

Synthesis of Bi2S3/BiVO4 Heterojunction with a One-Step Hydrothermal Method Based on pH Control and the Evaluation of Visible-Light Photocatalytic Performance

Bismuth-Graphene Nanohybrids: Synthesis, Reaction Mechanisms, and Photocatalytic Applications—A Review

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